| 摘要 |
PROBLEM TO BE SOLVED: To suppress generation of a turbulence of air within a working space etc. and efficiently control inflow wind speed to a front face opening arranged below a front face shutter, in a total exhaust type safety cabinet for countermeasures against biohazard. SOLUTION: A first wind speed sensor and a second wind speed sensor are provided within the working space and before an exhaust port, respectively. By an arithmetic circuit, a working space interior flow rate is computed based on the working space interior flow speed of air measured by the first wind speed sensor, and an exhaust flow rate is computed based on the exhaust flow speed of air measured by the second wind speed sensor. An air flow rate which is a difference between the exhaust flow rate and the working space interior flow rate is computed. Based on the difference flow rate and a cross section of an air inflow passage of the front face opening, the inflow speed of the air from the front face opening is computed. Based on the measurement result by the first flow speed sensor, the working space interior flow speed is controlled, and based on the computing result, the inflow speed is controlled. COPYRIGHT: (C)2010,JPO&INPIT |
